Balance the following chemical equation :

Mn0₂ + HCl MnCl₂ + Cl₂ + H₂0

23 Write any two observations in an activity which may suggest that a chemical reaction has taken place. Give an example in support of your answer. 24 Aluminium hydroxide reacts with sulphuric acid to form aluminium sulphate and water. Write a balanced equation for this reaction. 25 Write the balanced equations for the following reactions, and add the state symbols :

(a) Magnesium carbonate reacts with hydrochloric acid to produce magnesium chloride, carbon dioxide and water.

(b) Sodium hydroxide reacts with sulphuric acid to produce sodium sulphate and water.

26 Carbon monoxide reacts with hydrogen under certain conditions to form methanol (CH30H). Write a balanced chemical equation for this reaction indicating the physical states of reactants and product as well as the conditions under which this reaction takes place.